package com.httputils;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 * 
 * 需要在Application中注册，为了要在程序启动器就监控整个程序。
 * @author User
 *
 */
public class CrashHandler implements UncaughtExceptionHandler{


	public static final String TAG = "CrashHandler";

	// 系统默认的UncaughtException处理类
	private UncaughtExceptionHandler mDefaultHandler;
	// CrashHandler实例
	private static CrashHandler instance;
	// 程序的Context对象
	private Context mContext;
	// 用来存储设备信息和异常信息
	private Map<String, String> infos = new HashMap<String, String>();

	// 用于格式化日期,作为日志文件名的一部分
	private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
	private String sysVersion;
	private String softwareVersion;
	private String phoneSystem;
	private String phoneType;
	private String exceptionInfos;
	private String currentDateAndTime;

	/** 保证只有一个CrashHandler实例 */
	private CrashHandler() {
	}

	/** 获取CrashHandler实例 ,单例模式 */
	public static CrashHandler getInstance() {
		if (instance == null)
			instance = new CrashHandler();
		return instance;
	}

	/**
	 * 初始化
	 */
	public void init(Context context) {
		mContext = context;
		// 获取系统默认的UncaughtException处理器
		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
		// 设置该CrashHandler为程序的默认处理器
		Thread.setDefaultUncaughtExceptionHandler(this);
	}

	/**
	 * 当UncaughtException发生时会转入该函数来处理
	 */
	@Override
	public void uncaughtException(Thread thread, Throwable ex) {
		if (!handleException(ex) && mDefaultHandler != null) {
			// 如果用户没有处理则让系统默认的异常处理器来处理
			mDefaultHandler.uncaughtException(thread, ex);
		} else {
//			try {
//				Thread.sleep(3000);
//			} catch (InterruptedException e) {
//				Log.e(TAG, "error : ", e);
//			}
			// 退出程序
//			ActMain.this.finish();
//			((Activity) mContext).finish();
			android.os.Process.killProcess(android.os.Process.myPid());
			System.gc();
			System.exit(0);
		}
	}

	/**
	 * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
	 * 
	 * @param ex
	 * @return true:如果处理了该异常信息;否则返回false.
	 */
	private boolean handleException(Throwable ex) {
		if (ex == null) {
			return false;
		}
		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null) {
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		exceptionInfos = writer.toString(); //异常信息
		// 收集设备参数信息
		collectDeviceInfo(mContext);

		// 使用Toast来显示异常信息
		new Thread() {
			@Override
			public void run() {
				Looper.prepare();
				Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.",Toast.LENGTH_SHORT).show();
				Looper.loop();
			}
		}.start();
		// 保存日志文件
		saveCatchInfo2File(ex);
		return true;
	}

	/**
	 * 收集设备参数信息
	 * 
	 * @param ctx
	 */
	public void collectDeviceInfo(Context ctx) {
		SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");     
		Date curDate = new Date(System.currentTimeMillis()); //获取当前时间     
		currentDateAndTime = formatter.format(curDate);     
		String date[] = currentDateAndTime.split(" ");
		infos.put("exceptionDate", date[0]); //出现异常的日期
		infos.put("exceptionTime", date[1]); //出现异常的时间
		try {
			PackageManager pm = ctx.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),PackageManager.GET_ACTIVITIES);
			if (pi != null) {
				softwareVersion = pi.versionName == null ? "null": pi.versionName;
				infos.put("softwareVersion", softwareVersion);  //软件版本
			}
		} catch (NameNotFoundException e) {
			Log.e(TAG, "an error occured when collect package info", e);
		}
		 phoneSystem = Build.MODEL;
		 infos.put("phoneSystem", phoneSystem); //手机型号
		 phoneType = "Android";
		 infos.put("phoneType", phoneType);     //手机系统类型
		 sysVersion = Build.FINGERPRINT;
		 sysVersion = sysVersion.substring(sysVersion.indexOf(":")+1);
		 sysVersion = sysVersion.substring(0,sysVersion.indexOf("/"));
		 infos.put("sysVersion", sysVersion);  //手机系统版本
		 
		 SharedPreferences sp = ctx.getSharedPreferences("exceptionLog", Context.MODE_PRIVATE);
		 Editor editor = sp.edit();
		 editor.putBoolean("haveException", true); //出现异常的日期
		 editor.putString("exceptionDate", date[0]); //出现异常的日期
		 editor.putString("exceptionTime", date[1]); //出现异常的时间
		 editor.putString("softwareVersion", softwareVersion);  //软件版本
		 editor.putString("phoneSystem", phoneSystem); //手机系统
		 editor.putString("phoneType", phoneType);     //手机型号
		 editor.putString("sysVersion", sysVersion);   //手机系统版本
		 editor.putString("exceptionInfos", exceptionInfos);   //手机系统版本
		 editor.commit();
	}

	/**
	 * 保存错误信息到文件中
	 * 
	 * @param ex
	 * @return 返回文件名称,便于将文件传送到服务器
	 */
	private String saveCatchInfo2File(Throwable ex) {

		StringBuffer sb = new StringBuffer();
		for (Map.Entry<String, String> entry : infos.entrySet()) {
			String key = entry.getKey();
			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");
		}

		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null) {
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		exceptionInfos = writer.toString();
		sb.append(exceptionInfos);
		try {
			long timestamp = System.currentTimeMillis();
			String time = formatter.format(new Date());
			String fileName = "crash-" + time + "-" + timestamp + ".txt";
			if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
				String path = Environment.getExternalStorageDirectory().getAbsolutePath() + NetworkConstant.EXCEPTION_PATH;
				File dir = new File(path);
				if (!dir.exists()) {
					dir.mkdirs();
				}
				FileOutputStream fos = new FileOutputStream(path + fileName);
				fos.write(sb.toString().getBytes());
			
				sendCrashLog2PM(path + fileName);  	// 发送给开发人员
				fos.close();
			}
			return fileName;
		} catch (Exception e) {
			Log.e(TAG, "an error occured while writing file...", e);
		}
		return null;
	}

	/**
	 *  上传文件至Server的方法 
	 *  @param urlStr           服务器对应的路径 
	 *  @param serverFileName   上传服务器后在服务器上的文件名称 如：image.jpg 
	 *  @param uploadFile       要上传的文件路径 如：/sdcard/a.jpg
	 */
	public void uploadFile(String urlStr, String serverFileName, File uploadFile) {
		String end = "\r\n";
		String twoHyphens = "--";
		String boundary = "*****";
		try {
			URL url = new URL(urlStr);
			HttpURLConnection con = (HttpURLConnection) url.openConnection(); 
			con.setDoInput(true);  //允许输入流
			con.setDoOutput(true); //允许输出流
			con.setUseCaches(false);  //不允许使用缓存
			con.setRequestMethod("POST");  // 设置传送的method=POST 
			con.setRequestProperty("Connection", "Keep-Alive"); // setRequestProperty 
			con.setRequestProperty("Charset", "UTF-8"); //设置编码
			con.setRequestProperty("Content-Type","multipart/form-data;boundary=" + boundary);  //设置DataOutputStream 
			DataOutputStream ds = new DataOutputStream(con.getOutputStream());
			ds.writeBytes(twoHyphens + boundary + end);
			ds.writeBytes("Content-Disposition: form-data; "+ "name=\"file1\";filename=\"" + serverFileName + "\""+ end);
			ds.writeBytes(end); 
			FileInputStream fStream = new FileInputStream(uploadFile);  // 取得文件的FileInputStream 
			int bufferSize = 1024; //设置每次写入1024bytes 
			byte[] buffer = new byte[bufferSize];
			int length = -1; //从文件读取数据至缓冲区 
			while ((length = fStream.read(buffer)) != -1) {  // 将资料写入DataOutputStream中 
				ds.write(buffer, 0, length);
			}
			ds.writeBytes(end);
			ds.writeBytes(twoHyphens + boundary + twoHyphens + end); 
			fStream.close();
			ds.flush();  
			ds.close();
		} catch (Exception e) {
			
		}
	}
	
	/**
	 * 将捕获的导致崩溃的错误信息发送给开发人员
	 * 
	 * 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。
	 */
	private void sendCrashLog2PM(String fileName) {
		if (!new File(fileName).exists()) {
			Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();
			return;
		}
		FileInputStream fis = null;
		BufferedReader reader = null;
		String s = null;
		try {
			fis = new FileInputStream(fileName);
			reader = new BufferedReader(new InputStreamReader(fis, "UTF-8"));
			while (true) {
				s = reader.readLine();
				if (s == null)
					break;
				// 由于目前尚未确定以何种方式发送，所以先打出log日志。
				// TODO:将异常信息上传服务器
				Log.i("info", s.toString());
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally { // 关闭流
			try {
				reader.close();
				fis.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

}
